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There wont be exactly 450 FPS, but the PDI 200% spring will raise the FPS to a consistent 445-455 FPS depending on the cylinder and spring guide.
For 495-510 FPS, I believe a PDI 310% spring will do the job, but again it depends on the cylinder and spring guide.
But these estimates are based on a New England climate, I would ask a gun doc nearby, as air pressures/climate differ, and you may achieve different results
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